I've always adopted the approach on MOD land that if a path exists, it's usable. To prevent people riding on 'heritage' trails would be very harsh imho. But equally I can see that further extension of the trail network can't be allowed to continue unchecked; nor can widespread building of jumps and shore.
Twice I've actually discovered fires and called the brigade out. One on the top of Ash Ranges nr the clay pigeon ranges. And one on Barossa. I reckon they should give me an official armband and I'll do fire patrols for them.
As for littering. majority seems to be flytippers, or tonnes of empty AB Biscuit wrappers (surely no-one eats those?)
If we get stopped can we mention we're all friends with pants??